Which drug, commonly used as a pain management medication, is classified under Schedule II?

Oxycodone is classified as a Schedule II controlled substance due to its high potential for abuse, which can lead to severe physical or psychological dependence. As a potent opioid analgesic, it is commonly prescribed for the management of moderate to severe pain. The scheduling reflects the fact that while it has accepted medical uses, the risk associated with its misuse necessitates strict regulatory controls.

The other drugs listed do not fall under Schedule II. Propranolol is a non-selective beta-blocker used primarily for hypertension and anxiety, classified as a non-controlled substance. Duloxetine is a serotonin-norepinephrine reuptake inhibitor (SNRI) used for depression and certain pain disorders, also not controlled as a substance. Warfarin is an anticoagulant used to prevent blood clots and is classified as a non-controlled medication. Each of these medications, while important in their respective uses, does not carry the same risk of abuse or dependence as Oxycodone, justifying their omission from the controlled substances schedule.